Senel, Saliha Superior herniation of mediastinal thymus as a neck mass in children during valsalva maneuver. [electronic resource] - American journal of surgery Nov 2008 - 799 p. digital Publication Type: Comment; Letter ISSN: 1879-1883 Standard No.: 10.1016/j.amjsurg.2007.12.029 doi Subjects--Topical Terms: AdolescentChildChild, PreschoolDilatation, Pathologic--surgeryFemaleHumansInfantJugular Veins--pathologyMalePolyethylene TerephthalatesSurgical MeshSuture TechniquesThymus Gland--anatomy & histologyTreatment OutcomeValsalva ManeuverVascular Surgical Procedures